Pasteurizable thermoplastic film and receptacle therefrom

Details Pasteurizable thermoplastic film and receptacle therefrom Pasteurizable thermoplastic film and receptacle therefrom

B - Operations, Transporting

32

B

154/140, 18/783,

B32B 27/08 (2006.01)

Patent

CA 1172819

Abstract of the Disclosure Disclosed is a multi-layer, heat shrinkable, thermoplastic packaging film which can be heat sealed to itself to provide strong seals at pasteurizing temperatures. The preferred film has four layers including, in order, a sealing surface layer comprising a blend of propylene-ethylene copolymer and (butene-1)-ethylene copolymer, a layer comprising ethylene-vinyl acetate copolymer which may be cross-linked to further increase high temperature strength of the film as desired; a relatively gas impermeable layer comprising a copolymer of vinylidene chloride; and a surface layer of the same blend as the sealing layer. Receptacles such as end seal and side seal begs can be made from the film at a faster rate than with prior art films and these receptacles have the high temperature seal qualities of propylene polymers and the hot water shrink capabilities of ethylene polymers.

404718

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